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Diagnosis System

  1. DESCRIPTION 
    1. Data of the system can be read in the Data Link Connector 3 (DLC3) of the vehicle. Therefore, when the system seems to be malfunctioning, use the intelligent tester to check for a malfunction and repair it.
  2. CHECK DLC3 
    1. The vehicle's ECU uses ISO 15765-4 for communication protocol. The terminal arrangement of the DLC3 complies with SAE J1962 and matches the ISO 15765-4 format.
      Fig 1: Identifying DLC3 Connector Terminals
      G04828034Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      TERMINAL DESCRIPTION AND SPECIFIED CONDITION CHART

      Symbols (Terminal No.) Terminal Description Condition Specified Condition
      SIL (7) - SG (5) Bus "+" line During transmission Pulse generation
      CG (4) - Body ground Chassis ground Always Below 1 Ω
      SG (5) - Body ground Signal ground Always Below 1 Ω
      BAT (16) - Body ground Battery positive Always 10 to 14 V
      CANH (6) - CANL (14) CAN bus line Ignition switch OFF(1) 54 to 69 Ω
      CANH (6) - CG (4) HIGH-level CAN bus line Ignition switch OFF(1) 200 Ω or higher
      CANL (14) - CG (4) LOW-level CAN bus line Ignition switch OFF(1) 200 Ω or higher
      CANH (6) - BAT (16) HIGH-level CAN bus line Ignition switch OFF(1) 6 kΩ or higher
      CANL (14) - BAT (16) LOW-level CAN bus line Ignition switch OFF(1) 6 kΩ or higher
      (1) Before measuring the resistance, leave the vehicle as is for at least 1 minute and do not operate the ignition switch, any other switches or the doors.

      If the result is not as specified, the DLC3 may have a malfunction. Repair or replace the harness and connector.

    2. Connect the cable of the intelligent tester (with CAN VIM) to the DLC3, turn the ignition switch to the ON position and attempt to use the intelligent tester. If the screen displays a communication error message, a problem exists in the vehicle side or tester side.
      Fig 2: Connecting Intelligent Tester With CAN VIM To DLC3
      G05243219Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

      HINT:

      • If communication is normal when the tool is connected to another vehicle, inspect the DLC3 on the original vehicle.
      • If communication is still impossible when the tool is connected to another vehicle, the problem is probably in the tool itself. Consult the Service Department listed in the tool's instruction manual.
  3. INSPECT BATTERY VOLTAGE 
    1. Check the battery voltage.

      Standard voltage: 11 to 14 V 

      If the voltage is below 11V, replace the battery before proceeding.

  4. CHECK DIAGNOSIS 
    1. Turn the ignition switch ON.
    2. Operate the driver side switch of the master switch.
      Fig 3: Identifying Driver Side Switch Of Master Switch
      G05006550Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    3. Check the blinking pattern of the AUTO light as shown in the illustration.
      Fig 4: AUTO Light Blinking Pattern
      G05205071Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      1. If pattern (A) is displayed, reset power window regulator motor.
      2. If pattern (B) or (C) is displayed, check the wire harness.
      3. If the normal pattern is displayed, replace the multiplex network master switch.
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